JavaScript Event Loop & React Hooks Explained (Under the Hood)

Описание: 00:00: Introduction: Motivation and AI in coding.
01:45: JavaScript as a Single-Threaded Language.
02:30: Understanding the Event Loop & Call Stack.
03:15: The Microtask Queue (API requests & Promises).
04:50: Task Prioritization: Main Stack vs. Microtasks.
05:40: User Interaction & The Lowest Priority Queue.
07:05: Summary of JavaScript Engine Takeaways.
08:15: Transition to React: Components & Rendering.
09:30: How useState and useEffect work together.
11:00: Deep Dive into useRef & Storing References.
12:45: Rendering Cycles: A, B, and C render examples.
14:10: useRef vs. useState: When to use each.
15:00: Practical Example: Combining Event Loop knowledge with Hooks.
16:00: Outro and Final Summary.

Have you ever wondered how JavaScript handles multiple tasks when it's technically a single-threaded language? Or why your React hooks sometimes behave in ways you didn't expect?

In today’s video, we’re diving deep under the hood to explore the JavaScript Event Loop and the most common React hooks: useState, useEffect, and useRef. Whether you're a "vibe coder" using AI to build components or a junior developer looking to ace your next technical interview, understanding these core concepts is essential for debugging and writing efficient code.

We'll break down the Call Stack, Web APIs, the Microtask Queue (Promises), and the Macrotask Queue (setTimeout), then see how they interact with React’s rendering cycle.

Key Topics Covered:

Why JavaScript is single-threaded and how the Event Loop prevents freezing.

Prioritizing tasks: Main Stack vs. Microtasks vs. Macrotasks.

React rendering: How useState triggers UI updates.

useRef vs. useState: Sharing information across renders without re-rendering.

The lifecycle of a useEffect and handling asynchronous logic.

Keywords: JavaScript, Event Loop, React Hooks, Web Development, Frontend, Single-threaded, Promises, Async/Await, useState, useEffect, useRef, Programming Tutorial.

Hashtags: #JavaScript #ReactJS #WebDev #Coding #SoftwareEngineering #EventLoop #ReactHooks #FrontendDevelopment